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MINOR: compiler: add more macros to detect macro definitions

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We add __equals_0(NAME) which is only true if NAME is defined as zero,
and __def_as_empty(NAME) which is only true if NAME is defined as an
empty string.
This commit is contained in:
Willy Tarreau 2025-04-28 08:56:56 +02:00
parent 32b2b782e2
commit 5ac280f2a7
1 changed files with 18 additions and 0 deletions
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18
include/haproxy/compiler.h
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@ -55,6 +55,24 @@
#define ___equals_1(x) ____equals_1(comma_for_one ## x 1)
#define __equals_1(x) ___equals_1(x)
/* same but checks if defined as zero, useful to distinguish between -DFOO and
* -DFOO=0.
*/
#define comma_for_zero0 ,
#define _____equals_0(x, y, ...) (y)
#define ____equals_0(x, ...) _____equals_0(x, 0)
#define ___equals_0(x) ____equals_0(comma_for_zero ## x 1)
#define __equals_0(x) ___equals_0(x)
/* same but checks if defined as empty, useful to distinguish between -DFOO= and
* -DFOO=anything.
*/
#define comma_for_empty ,
#define _____def_as_empty(x, y, ...) (y)
#define ____def_as_empty(x, ...) _____def_as_empty(x, 0)
#define ___def_as_empty(x) ____def_as_empty(comma_for_empty ## x 1)
#define __def_as_empty(x) ___def_as_empty(x)
/* gcc 5 and clang 3 brought __has_attribute(), which is not well documented in
* the case of gcc, but is convenient since handled at the preprocessor level.
* In both cases it's possible to test for __has_attribute() using ifdef. When